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SSN (nuclear-powered attack submarine): nuclear submarine not carrying nuclear weapons, known as hunter-killers for ferocious pursuit of Soviet submarines. HMS Conqueror, which sank the Argentinian General Belgrano, was an SSN. They were armed with torpedoes and anti-ship missiles.

SSBN (nuclear-powered ballistic missile-carrying submarine): see ‘Resolution’ class.

tactical systems team: part of warfare team, providing complete tactical picture for captain and XO using information from sonar via sound room and periscopes if at PD, through use of target motion analysis to calculate course, speed and range of any given contact.

thermocline: temperature differentials within body of water due to seasonal variation, local conditions or latitude and longitude that give submarines acoustic blanket to hide in from sonar.

Trident: current British nuclear missile system that began replacing Polaris in 1994.

warfare team: team responsible for fighting the submarine under leadership of XO, who in turn reports to captain.